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st/mesa: Prefer alpha-less formats for RGB textures.

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This can e.g. increase the chance of being able to accelerate
glCopyTex(Sub)Image from an alpha-less renderbuffer.
This commit is contained in:
Michel Dänzer 2009-12-05 17:42:50 +01:00 • committed by Michel Dänzer
parent d13c603e37
commit 01537a84df
1 changed files with 32 additions and 4 deletions
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36
src/mesa/state_tracker/st_format.c
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@ -388,6 +388,33 @@ default_rgba_format(struct pipe_screen *screen,
return PIPE_FORMAT_NONE;
}
/**
* Find an RGB format supported by the context/winsys.
*/
static enum pipe_format
default_rgb_format(struct pipe_screen *screen,
enum pipe_texture_target target,
unsigned tex_usage,
unsigned geom_flags)
{
static const enum pipe_format colorFormats[] = {
PIPE_FORMAT_X8R8G8B8_UNORM,
PIPE_FORMAT_B8G8R8X8_UNORM,
PIPE_FORMAT_R8G8B8X8_UNORM,
PIPE_FORMAT_A8R8G8B8_UNORM,
PIPE_FORMAT_B8G8R8A8_UNORM,
PIPE_FORMAT_R8G8B8A8_UNORM,
PIPE_FORMAT_R5G6B5_UNORM
};
uint i;
for (i = 0; i < Elements(colorFormats); i++) {
if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
return colorFormats[i];
}
}
return PIPE_FORMAT_NONE;
}
/**
* Find an sRGBA format supported by the context/winsys.
*/
@ -472,13 +499,14 @@ st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
case 4:
case GL_RGBA:
case GL_COMPRESSED_RGBA:
case 3:
case GL_RGB:
case GL_COMPRESSED_RGB:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
return default_rgba_format( screen, target, tex_usage, geom_flags );
case 3:
case GL_RGB:
case GL_COMPRESSED_RGB:
return default_rgb_format( screen, target, tex_usage, geom_flags );
case GL_RGBA16:
if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
@ -500,7 +528,7 @@ st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
return default_rgba_format( screen, target, tex_usage, geom_flags );
return default_rgb_format( screen, target, tex_usage, geom_flags );
case GL_RGB5:
case GL_RGB4: